html,body{
    width: 100%;
    height: 100%;
}
body{
    background-image: url('../imgs/bg2.jpg');
    background-size: 100% 100%;
}
.form-signin{
    width: 300px;
    margin: 60px auto 0;
    input{
        margin-bottom: 15px;
    }
    .form-group{
        margin-bottom: 0;
    }
}